Search results for "Mask"

Precision Measurement of the RatioB(t→Wb)/B(t→Wq)and Extraction ofVtb

2011

We present a measurement of the ratio of top quark branching fractions R = B(t -> Wb)/B(t -> Wq), where q can be a d, s or b quark, in the lepton+jets and dilepton ttbar final states. The measurement uses data from 5.4 fb-1 of ppbar collisions collected with the D0 detector at the Fermilab Tevatron Collider. We measure R = 0.90 +/- 0.04, and we extract the CKM matrix element |Vtb| as |Vtb| = 0.95 +/- 0.02, assuming unitarity of the 3x3 CKM matrix.

Evidence forB0→ρ0ρ0Decays and Implications for the Cabibbo-Kobayashi-Maskawa Angleα

2007

We search for the decays B(0) --> rho(0)rho(0), B(0) --> rho(0)f(0)(980), and B(0) --> f(0)(980)f(0)(980) in a sample of about 384 x 10(6) Upsilon(4S) --> BB[over] decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at Stanford Linear Accelerator Center. We find evidence for B(0) --> rho(0)rho(0) with 3.5 sigma significance and measure the branching fraction B = (1.07 +/- 0.33 +/- 0.19) x 10(-6) and longitudinal polarization fraction f(L) = 0.87 +/- 0.13 +/- 0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix unitarity angle alpha due to penguin contributio…

Tevatron Combination of Single-Top-Quark Cross Sections and Determination of the Magnitude of the Cabibbo-Kobayashi-Maskawa Matrix Element Vtb

2015

et al.

Illumination correction on biomedical images

2014

RF-Inhomogeneity Correction (aka bias) artifact is an important re- search field in Magnetic Resonance Imaging (MRI). Bias corrupts MR images alter- ing their illumination even though they are acquired with the most recent scanners. Homomorphic Unsharp Masking (HUM) is a filtering technique aimed at correcting illumination inhomogeneity, but it produces a halo around the edges as a side effect. In this paper a novel correction scheme based on HUM is proposed to correct the artifact mentioned above without introducing the halo. A wide experimentation has been performed on MR images. The method has been tuned and evaluated using the simulated Brainweb image database. In this framework, the ap…

Reliģiski-filozofiski raksti, 27

2019

Vārdi starpdisciplinaritāte, starpdisciplinārs pētījums jau labu laiku ir kļuvuši par neatņemamu daļu zinātnieku ikdienas un vēl jo vairāk – projektu valodas – lietojumā. Atslēgvārds, modes vārds – lai kā mēs tos nosauktu, tas gandrīz ir kļuvis par obligātu pētījuma nosacījumu, prasot no zinātnieka drosmi un spēju iziet ārpus savas vienas un vienīgās nozares robežām un analizēt izvēlēto tēmu no vairāku zinātnes disciplīnu skatpunkta. Nesen blakus starpdisciplinaritātes jēdzienam zinātnei veltītajos politiskajos dokumentos un arī citos tekstos aizvien biežāk parādās vēl kāds vārds – transdisciplinaritāte. Atšķirībā no pirmās par šī vārda nozīmi viedokļi dalās, un pagaidām tāda līdz galam vie…

Event-related brain potentials of masked repetition and semantic priming while listening to sentences.

2012

We combined for the first time electrophysiological measures and masked priming technique in sentential context, by setting up a cross-modal masked priming paradigm involving the auditory presentation of sentences. ERPs were time-locked to an auditorily presented word that was preceded by a repeated, related or unrelated pattern masked prime. We registered a two-way N400-difference between unrelated and related/repeated primes, followed by a late positive component (LPC) for repetition priming. Related primes appear to facilitate the lexical-semantic processing of the target to the same extent repeated primes do (equally attenuated N400). Repetition priming exerts additional demands (LPC), …

Are coffee and toffee served in a cup? Ortho-phonologically mediated associative priming.

2008

We report three masked associative priming experiments with the lexical decision task that explore whether the initial activation flow of a visually presented word activates the semantic representations of that word's orthographic/phonological neighbours. The predictions of cascades and serial/modular models of lexical processing differ widely in this respect. Using a masked priming paradigm (stimulus onset asynchrony, SOA = 50 ms), words preceded by ortho-phonologically mediated associated “neighbours” ( oveja–MIEL, the Spanish for sheep–HONEY; note that oveja is a phonological neighbour of abeja, the Spanish for bee) were recognized more rapidly than words preceded by an unrelated word p…

Eisüberlastung in Daugava: Rembat (13.04.1904.)

1904

K. B. Dosa 1904. gada 13. aprīlī fotografētie ledus sastrēgumi Daugavā pie Rembates ar aprakstu. Foto 1: Ledus bloki (daļa kāda ledus "mūra") Daugavas labajā krastā pirms otrā strauta " mutes" lejpus dzirnavām pie Rembates. Skats augšup. Foto 2: Tā sauktās "Maskavas ielas" plūdi ar Daugavas ledu. Lejup Rembates, skats uz leju. (LU Muzeja Botānikas un mikoloģijas kolekcija M1613/288)

Counterfeit filtering facepiece respirators are posing an additional risk to health care workers during COVID-19 pandemic.

2020

Maskulinitātes saistība ar kompulsīvu pārēšanos, ruminēšanu un kompulsīvu trenēšanos vīriešiem

2021

Pētījuma mērķis bija teorētiski aprakstīt un veikt zinātniskās literatūras apkopojumu par maskulinitātes, kompulsīvās pārēšanās, ruminēšanas un kompulsīvās trenēšanās jēdzieniem, to savstarpējām sakarībām ar maskulinitāti, kā arī empīriski tās pārbaudīt vīriešu izlasē. Papildus tika pārbaudīts, vai maskulinitāte ir kā moderators starp kompulsīvu pārēšanos un kompulsīvu trenēšanos, starp ruminēšanu un kompulsīvu pārēšanos, kā arī starp ruminēšanu un kompulsīvu trenēšanos. Pētījumā piedalījās N = 150 pilngadību sasnieguši vīrieši. Pētījumā tika izmantotas četras aptaujas, Bēmas dzimumlomu aptauja (Bem Sex Role Inventory; BSRI, Bem, 1974), Ruminatīvas reaģēšanas aptauja (Ruminative Responses S…